WO2008031311A1 - Procédé d'établissement de paramètres de préfixes cycliques pour la modulation de signal sans fil - Google Patents

Procédé d'établissement de paramètres de préfixes cycliques pour la modulation de signal sans fil Download PDF

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Publication number
WO2008031311A1
WO2008031311A1 PCT/CN2007/001808 CN2007001808W WO2008031311A1 WO 2008031311 A1 WO2008031311 A1 WO 2008031311A1 CN 2007001808 W CN2007001808 W CN 2007001808W WO 2008031311 A1 WO2008031311 A1 WO 2008031311A1
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WO
WIPO (PCT)
Prior art keywords
symbol
cyclic prefix
bandwidth
wireless signal
long
Prior art date
Application number
PCT/CN2007/001808
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English (en)
Chinese (zh)
Inventor
Zhisong Zuo
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Zte Corporation
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Publication date
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Publication of WO2008031311A1 publication Critical patent/WO2008031311A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2647—Arrangements specific to the receiver only
    • H04L27/2655—Synchronisation arrangements
    • H04L27/2662—Symbol synchronisation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2602—Signal structure
    • H04L27/2605—Symbol extensions, e.g. Zero Tail, Unique Word [UW]
    • H04L27/2607—Cyclic extensions
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2626—Arrangements specific to the transmitter only
    • H04L27/2627—Modulators
    • H04L27/2634—Inverse fast Fourier transform [IFFT] or inverse discrete Fourier transform [IDFT] modulators in combination with other circuits for modulation
    • H04L27/2636—Inverse fast Fourier transform [IFFT] or inverse discrete Fourier transform [IDFT] modulators in combination with other circuits for modulation with FFT or DFT modulators, e.g. standard single-carrier frequency-division multiple access [SC-FDMA] transmitter or DFT spread orthogonal frequency division multiplexing [DFT-SOFDM]

Definitions

  • the present invention relates to a CP (Cyclic Prefix) parameter setting method based on Discrete Fourier Transform Spread Spectrum Orthogonal Frequency Division Multiplexing (DFT-S-OFDM) wireless signal modulation.
  • DFT-S-OFDM Discrete Fourier Transform Spread Spectrum Orthogonal Frequency Division Multiplexing
  • DFT Discrete Fourier Transform
  • OFDM orthogonal frequency division multiplexing
  • FIG. 1 a signal processing structure diagram of DFT-S-OFDM is shown.
  • the way to complement 0 is to add an equal number of 0s between each value of the F d sequence, and the remaining 0s are equally divided on the left and right sides of the entire sequence, as a guard band.
  • a certain number of samples at the tail of the signal generated by the foregoing method are copied to the front of the signal as a cyclic prefix CP (Cyclic Prefix) to form a complete symbol (Symbol).
  • CP Cyclic Prefix
  • the CP can protect the multipath components of the signal to prevent intersymbol interference.
  • the length of the symbol is variable depending on the value of the N point and the subcarrier spacing, and the device transmits data by transmitting consecutive symbols.
  • image 3 To demonstrate the continuous signal transmitted by the device. In each frame of DFT-S-OFDM, a plurality of symbols are included, and the lengths of the symbols may be different. Due to the nature of the digital signal, its sampling frequency is constant within the frame. Therefore, when the symbol length has a corresponding relationship with the number of sampling points occupied by the symbol, it is also consistent with the input point value N of the IFFT (as shown in FIG. 1).
  • DFT-S-OFDM technology has become a popular selection technology for uplink in 3GPP UMTS wireless communication technology in LTE.
  • DFT-S-OFDM supports time division and frequency division multiplexing of different users (UEs).
  • UEs users
  • the time division multiplexing because of the time division multiplexing, the time of falling and rising of the sampling point is set, and the CP of the first symbol of each frame of the wireless signal is longer than the CP of other symbols in the frame.
  • the bandwidth is 1.25MHz
  • the sampling rate is 1.92MHz
  • the appropriate sampling point drop and rise time is 4.17us, that is, 8 sampling points.
  • the DFT-S-OFDM uplink signals of the UE devices of different transmission bandwidths may also be frequency-multiplexed together to receive and decode for the same radio access device. See Figure 2 for a schematic diagram.
  • the technical problem to be solved by the present invention is to provide a CP parameter setting method in DFT-S-OFDM (Discrete Fourier Transform Spread Spectrum Orthogonal Frequency Division Multiplexing) wireless signal framing, so that any two different bandwidth UEs are transmitted.
  • the CPs of all symbols are aligned over time or are most likely aligned.
  • the present invention proposes a method for setting a cyclic prefix parameter of a wireless signal framing, comprising the following steps:
  • Step 1 Determine the minimum bandwidth transmitted by the UE in the multiplexing, which specifically includes the following steps:
  • step 2 the minimum bandwidth determined in step 1 and the cyclic prefix parameters of all other bandwidth systems greater than the bandwidth and the uplink subframe of the UE are set in the system, and the setting of the cyclic prefix parameter of each bandwidth sub-frame includes the following steps. :
  • ⁇ is the base cyclic prefix length
  • / is the frame length
  • r is the sampling point drop and rise reservation time, and is determined according to the minimum bandwidth of the UE transmission in the multiplexing obtained in step 1
  • r is A unique value applied to all bandwidths
  • L b is the symbol length without the cyclic prefix
  • S is the number of symbols in the frame. Is the sampling frequency.
  • the method for setting a cyclic prefix parameter of a wireless signal framing according to the present invention wherein: a cyclic prefix with a bandwidth of 5 MHz and a first symbol of a UE uplink subframe is 5.08 us long or 39 sample points; The sampling point to the 8th symbol is 4.04us long or 31 sampling points.
  • the method for setting a cyclic prefix parameter of a wireless signal framing according to the present invention is characterized in that a cyclic prefix of a first symbol in a system with a bandwidth of 10 MHz and an uplink subframe of a UE is 5.08 us long or 78 sampling points.
  • the sampling points of the 2nd to 8th symbols are 4.04us long or 62 sampling points.
  • the method for setting a cyclic prefix parameter of a wireless signal framing is characterized in that: a cyclic prefix of a first symbol in a system with a bandwidth of 15 MHz and an uplink subframe of a UE is 5.08 us long or 117 sampling points.
  • the sampling points of the 2nd to 8th symbols are 4.04us long or 93 sampling points.
  • the method for setting a cyclic prefix parameter of a wireless signal framing is characterized in that: a cyclic prefix of a first symbol in a system with a bandwidth of 20 MHz and a subframe in an uplink subframe of the UE is 5.08 us long or 156 sampling points.
  • the sampling points of the 2nd to 8th symbols are 4.04us long or 124 sampling points.
  • the present invention also provides a method for transmitting a wireless signal, wherein the wireless signal includes a plurality of symbols including a cyclic prefix, and is characterized by:
  • the cyclic prefix of the first symbol transmitted by the terminal is 5.08 us long or 156 sample points; the terminal transmits the second one to The sampling point of the 8th symbol is 4.04us long or 124 sampling points; or: The terminal transmits the rising and falling times of the 1st and 8th symbol cyclic prefix for a total of 32 sampling points; ..
  • the cyclic prefix of the first symbol transmitted by the terminal is 5.21us long or 160 sampling points;
  • the sampling point at which the terminal transmits the 2nd to 7th symbols is 4.69us long or 144 sampling points; or:
  • the terminal transmits the rising and falling times of the 1st and 7th symbol cyclic prefixes for a total of 32 sampling points.
  • the method for transmitting a wireless signal according to the present invention wherein the wireless signal is a single carrier frequency division multiple access wireless signal.
  • the single carrier frequency division multiple access wireless signal is a discrete Fourier transform spread spectrum orthogonal frequency division multiplexing wireless signal.
  • the single carrier frequency division multiple access wireless signal is an interleaved frequency division multiple access wireless signal.
  • the method for transmitting a wireless signal according to the present invention wherein the sampling period of the system having a bandwidth of 20 MHz is 0.0326 us.
  • the present invention determines the length of the CP of each symbol in a frame by a given method and sets the CP so that the UEs of different transmission bandwidths are aligned at the falling and rising reservation times of the CP and the sampling point for the same system.
  • the setting of the CP also remains relatively uniform in every frame.
  • the parameters set by the present invention enable the ability of each symbol to resist multipath interference during transmission to be maximized. This method avoids blind detection during random access.
  • the UE sampling rate of different bandwidths is multiplied, the number of points per CP in different bandwidths is proportionally multiplied, which simplifies the baseband processing and also makes the air interface settings available.
  • FIG. 1 is a schematic diagram of subcarrier mapping of DFT-S-OFDM
  • Figure 3 is a frame structure diagram of symbol framing of an air signal
  • FIG. 5 is a structural diagram of a frame in an embodiment of the present invention.
  • the scenario applied by the present invention is: A wireless access system, wherein the DFT-S-OFDM signal is used for uplink wireless transmission multiplexing, and the uplink access UE has different transmission bandwidths, but is multiplied.
  • sampling frequency When introducing the CP parameter setting method of the DFT-S-OFDM signal of the present invention, some parameters are first introduced: sampling frequency, length of the frame, number of symbols, symbol of the removed CP (called "block") length, UE in multiplexing The minimum bandwidth of the transmission, as well as the sampling frequency and minimum bandwidth The sampling point drops and rises the reserved time.
  • the sampling frequency varies according to the UE's transmission bandwidth.
  • the present invention determines the minimum bandwidth transmitted by a UE in multiplexing by the following method:
  • the falling and rising reservation time of the corresponding sampling point is determined, and the value is applied to all higher bandwidths to become a unique value.
  • the present invention uses the following steps to set the length of each CP in the frame for the system with the same transmission bandwidth and the wireless transmission interface of the UE:
  • the reference CP length is the frame length to remove all the block lengths, then remove the falling and rising reservation time of the sampling points, and then evenly distribute the symbols to each frame. Value, ie: the length of the reference CP is
  • the length of the first CP is the reference CP length plus the drop and rise reservation time of the sampling point.
  • the CP of each symbol s in the frame is xi J samples.
  • the minimum transmission bandwidth of the UE and its corresponding sampling rate determine the falling and rising reservation time of the sampling point.
  • the number of sampling points of other higher bandwidths in the same reserved time increases in the sampling frequency and increases in proportion.
  • the number of samples is in full compliance with the formula
  • the length of the CP produced at this time is the most satisfactory.
  • step 3 The symbols corresponding to the CPs with the long sampling points are uniformly selected at equal intervals within the frame.
  • the radio access device does not need to know the bandwidth type of the UE in advance, thereby avoiding blind detection.
  • the length of the CP set above is determined in advance.
  • the sampling rate is also expanded by the same multiple. Therefore, the length of the CP can also be expanded by the same multiple, that is, the sample of the original CP is multiplied by the same multiple to obtain the expanded sample. Points. This makes it easier to implement, and the design is more portable.
  • FIG. 4 shows an access system according to an embodiment of the present invention, including a wireless access device and a handheld user equipment (UE) thereof.
  • the present invention is applied to a parameter portion of a DFT-S-OFDM uplink signal of a UE.
  • UE handheld user equipment
  • the UE transmitting the uplink allocated bandwidth may be configured as one of the following values: 1.25 MHz, 2.5 MHz, 5 MHz, 10 MHz, 15 MHz, 20 MHz. This set of values is an integer multiple of 1.25M, which facilitates flexible bandwidth allocation. Bandwidth can be configured with different 6 sets of values. The corresponding sampling rates are shown in Table 1. The sampling rate is proportional to the allocated bandwidth. In this embodiment, 10 MHz is the minimum bandwidth capability, that is, the system requires each UE to transmit and receive with a bandwidth of 10 MHz.
  • the maximum multiplier expansion bandwidth can be calculated as 5M, that is, the sampling rate corresponding to the 5M bandwidth is multiplied by 2, 3 and 4 to obtain the sampling rate of 10MJ5M and 20M. Taking the minimum value of the previous two bandwidth values, it is known that the minimum bandwidth transmitted by the UE in the multiplexing is 5M.
  • the set sampling point drop and rise reservation time is 8 sampling points under 5M, which is l/960ms. For all bandwidths above 5M, the sampling point drop and rise reservation time are both 1 /960ms. Allocation bandwidth frame length sampling rate long block short block CP length
  • the structure of the frame is shown in Figure 5.
  • the black and half white is the rise and fall time
  • the white frame is the CP without the rising and falling time.
  • Each block and the CP located in front of it form a symbol.
  • the block length and frame length parameters are fixed.
  • the long block is l/15ms
  • the short block is l/30ms
  • the frame length is 0.5ms.
  • the block lengths in Table 1 are reduced to approximate numbers.
  • the number of samples included in the CP is multiplied. This feature can be used very well for devices generated at certain clock frequencies.
  • the sampling frequency is actually also derived from the clock frequency.
  • the usual conversion method is the method of multiplying and dividing.
  • the effective CP caused by the misalignment is avoided.
  • the length is reduced. Therefore the effective CP length is maximized.
  • the blind detection phenomenon of the uplink random access of the UE is also well avoided, that is, when accessing the system of a specific bandwidth, the symbol positions of all UEs are aligned in the subframe, regardless of the bandwidth and corresponding parameters. .
  • the minimum bandwidth of the chirp transmission in the frequency division multiplexing is directly specified. It is 1.25MHz and the frame length is 0.5ms.
  • the principle of setting the CP length is still the above method. That is, the sampling rise and fall times of other bandwidths are set based on the rising and falling time of the sampling point of 1.25 MHz.
  • the set drop point and rise reserve time is 1 sample point at 1.25M, which is l/1920ms; the number of blocks is 7. Additional emission methods can be constructed using the same CP setup method. See Table 2:
  • the terminal transmits the first symbol, and its symbol cyclic prefix transmits the sample 160 times;
  • the terminal transmits the 2nd to 7th symbols, and each symbol cyclic prefix transmits the samples 144 times; of course, it does not exclude that the symbol in which the longer cyclic prefix is located is the last symbol, or the rising and falling segments are separately separated. Assigned to the first symbol and the last symbol, but said rising and falling emission samples are 16 times in total.
  • the wireless signal in the method for transmitting a wireless signal according to the embodiment of the present invention may be a single carrier frequency division multiple access wireless signal, or may be a discrete Fourier transform spread spectrum orthogonal frequency division multiplexing wireless. Signal or interleaved frequency division multiple access wireless signals.
  • the modulation method of the signal can be converted.
  • the minimum bandwidth transmitted by the UE in the frequency division multiplexing is 2.5 MHz.
  • the principle of setting the CP length is still the above method. That is, the sampling rise and fall time of the other bandwidth is set based on the rise and fall time of the sampling point of 2.5 MHz.
  • the modulation of the signal is a pre-processing OFDM system. The principle of setting the CP length is still the above method.
  • the CP is such that, for the same system, UEs with different transmission bandwidths are aligned between the CP and the sampling point falling and rising.
  • the setting of the CP also remains relatively uniform in each frame.
  • the parameters set by the present invention enable the ability of each symbol to resist multipath interference during transmission to be maximized. This method avoids blind detection during random access.
  • the sampling rate of the UEs of different bandwidths is multiplied, the number of points per CP in different bandwidths is proportionally multiplied, so that the baseband processing is compressed and the setting of the air interface is simplified.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention concerne un procédé d'établissement de paramètres de préfixes cycliques pour la modulation d'une trame de signaux sans fil. Le procédé comprend : d'abord, la détermination de la bande passante minimale transmise de l'équipement d'utilisateur en multiplexage; ensuite, l'établissement de la longueur de préfixe cyclique (CP) qui est utilisé dans l'interface transmise par l'utilisateur; en fonction de la longueur de préfixe cyclique et la bande passante minimale, l'établissement du premier symbole et de la longueur de préfixe cyclique d'autres symboles; selon les différentes conditions, l'établissement d'instants d'échantillonnage de chaque symbole dans une trame. Grâce au procédé selon l'invention, par rapport à un équipement d'utilisateur à bande passante différente, le temps de réservation de liaison montante et descendante de CP et de points d'échantillonnage peut être aligné. Les paramètres de préfixes cycliques sont uniformes dans chaque trame. Les paramètres déterminés assurent à chaque symbole la capacité maximale de résister à une interférence multitrajets. Lors de l'accès aléatoire, le procédé peut éviter la détection aveugle. Lorsque les rapports d'échantillonnage des différents équipements d'utilisateur sont à échelle multiple, chacun des nombres de préfixe cyclique avec différentes bandes passantes sont à échelle multiple. Le procédé simplifie la procédure de bande passante, et rend l'établissement d'interface radio plus simple.
PCT/CN2007/001808 2006-09-07 2007-06-07 Procédé d'établissement de paramètres de préfixes cycliques pour la modulation de signal sans fil WO2008031311A1 (fr)

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CN200610127688.5 2006-09-07
CN200610127688A CN100589471C (zh) 2006-09-07 2006-09-07 一种无线信号成帧的循环前缀参数设置方法

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3487137A4 (fr) * 2016-07-14 2020-03-25 ZTE Corporation Procédé et dispositif de transmission de données

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101534271B (zh) * 2008-03-14 2012-07-18 中兴通讯股份有限公司 一种无线通信系统中支持高速移动性的方法
US10341042B2 (en) * 2015-07-27 2019-07-02 Qualcomm Incorporated Narrowband operation with reduced sampling rate

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EP1237340A1 (fr) * 2001-03-01 2002-09-04 Texas Instruments Incorporated Conception de fenêtre de réception pour systèmes multiporteuses de communication
CN1578292A (zh) * 2003-07-08 2005-02-09 三星电子株式会社 正交频分复用系统中的发送和接收设备及方法
CN1747462A (zh) * 2005-10-20 2006-03-15 清华大学 一种正交频分复用系统信号发送及接收方法

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1237340A1 (fr) * 2001-03-01 2002-09-04 Texas Instruments Incorporated Conception de fenêtre de réception pour systèmes multiporteuses de communication
CN1578292A (zh) * 2003-07-08 2005-02-09 三星电子株式会社 正交频分复用系统中的发送和接收设备及方法
CN1747462A (zh) * 2005-10-20 2006-03-15 清华大学 一种正交频分复用系统信号发送及接收方法

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3487137A4 (fr) * 2016-07-14 2020-03-25 ZTE Corporation Procédé et dispositif de transmission de données

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CN101141430A (zh) 2008-03-12

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